DYNAMIC SCROLLBAR CLASS
Author: Simon Coulton (scoulton@hotmail.com - MSN only)
Date: 23/11/2006
Version: 3.0

Availability: ActionScript 2.0; Flash Player 8

Scroller(content:MovieClip, height:Number, "ease:Number,speed:Number", type:String, up:MovieClip, down:MovieClip, dragger:MovieClip, track:MovieClip);
Parameters
content:MovieClip - The content that is going to be scrolled.
height:Number - The height of the mask (Note: Mask is dynamically created)
ease:Number - The amount of easing.
speed:Number - The speed of the scroll / dragger.
type:String - Either: 'click' or 'over' or 'both', click means the user must click the buttons, over will react to rollovers, both will react to clicks and over. Defaults to click.
down:MovieClip - The down button movieclip.
up:MovieClip - The up button movieclip.
dragger:MovieClip - The dragger movieclip.
track:MovieClip - The bar the dragger sits on.

Methods:
init();
- Initialises the scrollbar for use.

disable(type:String,alpha:Number [optional]);
- type can be either a) Hidden b) Trans. If not specified it will default to 'Hidden'.
- alpha can only be set if type is set to 'Trans'. If not specified it will default to 50.

output();
- Outputs either error messages (if Scrollbar creation has failed), or Scrollbar attributes if successful.

Requirements
The following instances must be on the stage for the scrollbar to work.
- Dragger [MovieClip]
- Up button [MovieClip]
- Down button [MovieClip]
- Content [MovieClip]

Example
See Scrollbar.fla for an example.

Notes
This scrollbar will not run any Intervals/EnterFrames when not actually moving to make it easier on slower machines.
Also creates the Mask dynamically so that you don't have to worry about additional layers in your timeline.
** Be sure to have a 0% alpha background inside your content:MovieClip if you are scrolling straight text.
Flash returns text height incorrectly, this is a work around for that. An example of this is in the FLA **

Updates:
2.1
- Added MouseWheel capability.
- Added Key (UP/Down) capability.
3.0
- Complete re-write.
- Added output function.
- Added disable function.
- Scroll calculation fixed.
- maxUp changed on every updateContentPosition() call, allows for dynamically resizing content.
- Error checking for easing/movement speed values.

Fonts used: Supertext, [link]